Method and System for Positioning Mobile Terminal in LTE System

Abstract

Provided is a method for positioning a mobile terminal in an LTE system, wherein the method comprises: a serving cell/base station sends respectively resource reservation notification messages to multiple neighbouring cells/base stations thereof, to notify the neighbouring cells/base stations to reserve measurement resources for SRS measurement of a mobile terminal; the mobile terminal sends SRSs to the serving cell/base station and the neighbouring cells/base stations by using the measurement resources respectively, so that the serving cell/base station and the neighbouring cells/base stations perform SRS measurement; and the serving cell/base station positions the mobile terminal according to results of the SRS measurement. Also provided is a corresponding system.

1 . A method for positioning a mobile terminal in an LTE system, comprising:
 a serving cell/NodeB respectively sending resource reservation notification messages to multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, to notify the multiple neighbouring cells/NodeBs to reserve measurement resources which are for a mobile terminal to perform Sounding Reference Signal (SRS) measurement;   the mobile terminal respectively sending SRSs to the serving cell/NodeB and the multiple neighbouring cells/NodeBs by using the measurement resources to enable the serving cell/NodeB and the neighbouring cells/NodeBs to measure the SRSs; and   the serving cell/NodeB positioning the mobile terminal according to results that the serving cell/NodeB and the neighbouring cells/NodeBs respectively measure the SRSs.   
     
     
         2 . The method according to  claim 1 , wherein each of the results that the serving cell/NodeB and the neighbouring cells/NodeBs measure the SRSs comprises a received signal strength indicator and a timing advance. 
     
     
         3 . The method according to  claim 1 , wherein before the serving cell/NodeB respectively sends the resource reservation notification messages to the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, the method further comprises:
 the serving cell/NodeB judging whether there is pre-stored information about the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB; if there is not the pre-stored information about the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, then notifying the mobile terminal to measure information about the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, or initiating a paging message to the mobile terminal to acquire information about the multiple neighbouring cells/NodeBs.   
     
     
         4 . The method according to  claim 1 , wherein the serving cell/NodeB positioning the mobile terminal according to the results that the serving cell/NodeB and the neighbouring cells/NodeBs respectively measure the SRSs comprises:
 the serving cell/NodeB summarizing the results that the serving cell/NodeB and the multiple neighbouring cells/NodeBs respectively measure the SRSs;   calculating a distance between the mobile terminal and the serving cell/NodeB and each distance between the mobile terminal and each of the neighbouring cells/NodeBs through the timing advance; and according to each pre-stored distance between the serving cell/NodeB and each of the neighbouring cells/NodeBs, respectively calculating each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs; and   according to the distance between the mobile terminal and the serving cell/NodeB, each distance between the mobile terminal and each of neighbouring cells/NodeBs, and each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs, positioning the mobile terminal.   
     
     
         5 . A system for positioning a mobile terminal in an LTE system, comprising a mobile terminal, a serving cell/NodeB and multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, wherein
 the serving cell/NodeB is configured to respectively send resource reservation notification messages to the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, to notify the multiple neighbouring cells/NodeBs to reserve measurement resources which are for a mobile terminal to perform Sounding Reference Signal (SRS) measurement; to measure an SRS according to the SRS sent by the mobile terminal; and to position the mobile terminal according to results that the serving cell/NodeB and the multiple neighbouring cells/NodeBs measure the SRSs;   the mobile terminal is configured to respectively send SRSs to the serving cell/NodeB and neighbouring cells/NodeBs through the measurement resources; and   the multiple neighbouring cells/NodeBs is configured to measure the SRSs according to the SRSs sent by the mobile terminal.   
     
     
         6 . The system according to  claim 5 , wherein each of the results that the serving cell/NodeB and neighbouring cells/NodeBs measure the SRSs comprises a received signal strength indicator and a timing advance. 
     
     
         7 . The system according to  claim 5 , wherein the serving cell/NodeB is further configured to:
 judge whether there is pre-stored information about the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB; if there is not pre-stored information about the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, then notify the mobile terminal to measure information about the multiple neighbouring cells/NodeBs adjacent to the serving cell/NodeB, or initiate a paging message to the mobile terminal so as to acquire information about the multiple neighbouring cells/NodeBs.   
     
     
         8 . The system according to  claim 5 , wherein the serving cell/NodeB comprises:
 a summarizing component configured to summarize the results that the serving cell/NodeB and the multiple neighbouring cells/NodeBs respectively measure the SRSs;   a first calculation component configured to acquire a distance between the mobile terminal and the serving cell/NodeB and each distance between the mobile terminal and the neighbouring cells/NodeBs through the timing advance;   a second calculation component configured to respectively calculate each angle between the serving cell/NodeB and each of the multiple neighbouring cells/NodeBs according to each pre-stored distance between the serving cell/NodeB and each of the multiple neighbouring cells/NodeBs; and   a positioning component configured to, according to the distance between the mobile terminal and the serving cell/NodeB, each distance between the mobile terminal and each of the multiple neighbouring cells/NodeBs, and each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs, position the mobile terminal.   
     
     
         9 . The method according to  claim 2 , wherein the serving cell/NodeB positioning the mobile terminal according to the results that the serving cell/NodeB and the neighbouring cells/NodeBs respectively measure the SRSs comprises:
 the serving cell/NodeB summarizing the results that the serving cell/NodeB and the multiple neighbouring cells/NodeBs respectively measure the SRSs;   calculating a distance between the mobile terminal and the serving cell/NodeB and each distance between the mobile terminal and each of the neighbouring cells/NodeBs through the timing advance; and according to each pre-stored distance between the serving cell/NodeB and each of the neighbouring cells/NodeBs, respectively calculating each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs; and   according to the distance between the mobile terminal and the serving cell/NodeB, each distance between the mobile terminal and each of neighbouring cells/NodeBs, and each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs, positioning the mobile terminal.   
     
     
         10 . The method according to  claim 3 , wherein the serving cell/NodeB positioning the mobile terminal according to the results that the serving cell/NodeB and the neighbouring cells/NodeBs respectively measure the SRSs comprises:
 the serving cell/NodeB summarizing the results that the serving cell/NodeB and the multiple neighbouring cells/NodeBs respectively measure the SRSs;   calculating a distance between the mobile terminal and the serving cell/NodeB and each distance between the mobile terminal and each of the neighbouring cells/NodeBs through the timing advance; and according to each pre-stored distance between the serving cell/NodeB and each of the neighbouring cells/NodeBs, respectively calculating each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs; and   according to the distance between the mobile terminal and the serving cell/NodeB, each distance between the mobile terminal and each of neighbouring cells/NodeBs, and each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs, positioning the mobile terminal.   
     
     
         11 . The system according to  claim 6 , wherein the serving cell/NodeB comprises:
 a summarizing component configured to summarize the results that the serving cell/NodeB and the multiple neighbouring cells/NodeBs respectively measure the SRSs;   a first calculation component configured to acquire a distance between the mobile terminal and the serving cell/NodeB and each distance between the mobile terminal and the neighbouring cells/NodeBs through the timing advance;   a second calculation component configured to respectively calculate each angle between the serving cell/NodeB and each of the multiple neighbouring cells/NodeBs according to each pre-stored distance between the serving cell/NodeB and each of the multiple neighbouring cells/NodeBs; and   a positioning component configured to, according to the distance between the mobile terminal and the serving cell/NodeB, each distance between the mobile terminal and each of the multiple neighbouring cells/NodeBs, and each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs, position the mobile terminal.   
     
     
         12 . The system according to  claim 7 , wherein the serving cell/NodeB comprises:
 a summarizing component configured to summarize the results that the serving cell/NodeB and the multiple neighbouring cells/NodeBs respectively measure the SRSs;   a first calculation component configured to acquire a distance between the mobile terminal and the serving cell/NodeB and each distance between the mobile terminal and the neighbouring cells/NodeBs through the timing advance;   a second calculation component configured to respectively calculate each angle between the serving cell/NodeB and each of the multiple neighbouring cells/NodeBs according to each pre-stored distance between the serving cell/NodeB and each of the multiple neighbouring cells/NodeBs; and   a positioning component configured to, according to the distance between the mobile terminal and the serving cell/NodeB, each distance between the mobile terminal and each of the multiple neighbouring cells/NodeBs, and each angle between the serving cell/NodeB and each of the neighbouring cells/NodeBs, position the mobile terminal.